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https://issues.apache.org/jira/browse/KAFKA-15537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Federico Valeri updated KAFKA-15537:
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Fix Version/s: 3.7.0
3.6.1
> Unsafe metadata.version downgrade is not supported
> --------------------------------------------------
>
> Key: KAFKA-15537
> URL: https://issues.apache.org/jira/browse/KAFKA-15537
> Project: Kafka
> Issue Type: Bug
> Components: documentation
> Affects Versions: 3.5.1
> Reporter: Federico Valeri
> Assignee: Federico Valeri
> Priority: Major
> Fix For: 3.7.0, 3.6.1
>
>
> In KIP-778 we introduced the "unsafe" downgrade in case metadata has changes
> in one of the versions between target and current, as defined in
> MetadataVersion.
> This is a lossy downgrade where each node rebuilds its metadata snapshots,
> omitting the metadata changes.
> Currently, this is not supported, as shown by the following command.
> {code}
> bin/kafka-features.sh --bootstrap-server :9092 downgrade --metadata 3.4
> --unsafe
> Could not downgrade metadata.version to 8. Invalid metadata.version 8. Unsafe
> metadata downgrade is not supported in this version.
> 1 out of 1 operation(s) failed.
> {code}
> The documentation says it is possible:
> "Note that the cluster metadata version cannot be downgraded to a
> pre-production 3.0.x, 3.1.x, or 3.2.x version once it has been upgraded.
> However, it is possible to downgrade to production versions such as 3.3-IV0,
> 3.3-IV1, etc."
> Also, the error messages could be improved, as it currently suggests to run
> an unsafe downgrade that doesn't work.
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